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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * linux/drivers/mmc/sdio.c4 *5 * Copyright 2006-2007 Pierre Ossman6 */7 8#include <linux/err.h>9#include <linux/pm_runtime.h>10#include <linux/sysfs.h>11 12#include <linux/mmc/host.h>13#include <linux/mmc/card.h>14#include <linux/mmc/mmc.h>15#include <linux/mmc/sdio.h>16#include <linux/mmc/sdio_func.h>17#include <linux/mmc/sdio_ids.h>18 19#include "core.h"20#include "card.h"21#include "host.h"22#include "bus.h"23#include "quirks.h"24#include "sd.h"25#include "sdio_bus.h"26#include "mmc_ops.h"27#include "sd_ops.h"28#include "sdio_ops.h"29#include "sdio_cis.h"30 31MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);32MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);33MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);34MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);35MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);36 37#define sdio_info_attr(num) \38static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \39{ \40 struct mmc_card *card = mmc_dev_to_card(dev); \41 \42 if (num > card->num_info) \43 return -ENODATA; \44 if (!card->info[num - 1][0]) \45 return 0; \46 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \47} \48static DEVICE_ATTR_RO(info##num)49 50sdio_info_attr(1);51sdio_info_attr(2);52sdio_info_attr(3);53sdio_info_attr(4);54 55static struct attribute *sdio_std_attrs[] = {56 &dev_attr_vendor.attr,57 &dev_attr_device.attr,58 &dev_attr_revision.attr,59 &dev_attr_info1.attr,60 &dev_attr_info2.attr,61 &dev_attr_info3.attr,62 &dev_attr_info4.attr,63 &dev_attr_ocr.attr,64 &dev_attr_rca.attr,65 NULL,66};67ATTRIBUTE_GROUPS(sdio_std);68 69static const struct device_type sdio_type = {70 .groups = sdio_std_groups,71};72 73static int sdio_read_fbr(struct sdio_func *func)74{75 int ret;76 unsigned char data;77 78 if (mmc_card_nonstd_func_interface(func->card)) {79 func->class = SDIO_CLASS_NONE;80 return 0;81 }82 83 ret = mmc_io_rw_direct(func->card, 0, 0,84 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);85 if (ret)86 goto out;87 88 data &= 0x0f;89 90 if (data == 0x0f) {91 ret = mmc_io_rw_direct(func->card, 0, 0,92 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);93 if (ret)94 goto out;95 }96 97 func->class = data;98 99out:100 return ret;101}102 103static int sdio_init_func(struct mmc_card *card, unsigned int fn)104{105 int ret;106 struct sdio_func *func;107 108 if (WARN_ON(fn > SDIO_MAX_FUNCS))109 return -EINVAL;110 111 func = sdio_alloc_func(card);112 if (IS_ERR(func))113 return PTR_ERR(func);114 115 func->num = fn;116 117 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {118 ret = sdio_read_fbr(func);119 if (ret)120 goto fail;121 122 ret = sdio_read_func_cis(func);123 if (ret)124 goto fail;125 } else {126 func->vendor = func->card->cis.vendor;127 func->device = func->card->cis.device;128 func->max_blksize = func->card->cis.blksize;129 }130 131 card->sdio_func[fn - 1] = func;132 133 return 0;134 135fail:136 /*137 * It is okay to remove the function here even though we hold138 * the host lock as we haven't registered the device yet.139 */140 sdio_remove_func(func);141 return ret;142}143 144static int sdio_read_cccr(struct mmc_card *card, u32 ocr)145{146 int ret;147 int cccr_vsn;148 int uhs = ocr & R4_18V_PRESENT;149 unsigned char data;150 unsigned char speed;151 152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);153 if (ret)154 goto out;155 156 cccr_vsn = data & 0x0f;157 158 if (cccr_vsn > SDIO_CCCR_REV_3_00) {159 pr_err("%s: unrecognised CCCR structure version %d\n",160 mmc_hostname(card->host), cccr_vsn);161 return -EINVAL;162 }163 164 card->cccr.sdio_vsn = (data & 0xf0) >> 4;165 166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);167 if (ret)168 goto out;169 170 if (data & SDIO_CCCR_CAP_SMB)171 card->cccr.multi_block = 1;172 if (data & SDIO_CCCR_CAP_LSC)173 card->cccr.low_speed = 1;174 if (data & SDIO_CCCR_CAP_4BLS)175 card->cccr.wide_bus = 1;176 177 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {178 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);179 if (ret)180 goto out;181 182 if (data & SDIO_POWER_SMPC)183 card->cccr.high_power = 1;184 }185 186 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);188 if (ret)189 goto out;190 191 card->scr.sda_spec3 = 0;192 card->sw_caps.sd3_bus_mode = 0;193 card->sw_caps.sd3_drv_type = 0;194 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {195 card->scr.sda_spec3 = 1;196 ret = mmc_io_rw_direct(card, 0, 0,197 SDIO_CCCR_UHS, 0, &data);198 if (ret)199 goto out;200 201 if (mmc_host_uhs(card->host)) {202 if (data & SDIO_UHS_DDR50)203 card->sw_caps.sd3_bus_mode204 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50205 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;206 207 if (data & SDIO_UHS_SDR50)208 card->sw_caps.sd3_bus_mode209 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25210 | SD_MODE_UHS_SDR12;211 212 if (data & SDIO_UHS_SDR104)213 card->sw_caps.sd3_bus_mode214 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50215 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;216 }217 218 ret = mmc_io_rw_direct(card, 0, 0,219 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);220 if (ret)221 goto out;222 223 if (data & SDIO_DRIVE_SDTA)224 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;225 if (data & SDIO_DRIVE_SDTC)226 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;227 if (data & SDIO_DRIVE_SDTD)228 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;229 230 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0, &data);231 if (ret)232 goto out;233 234 if (data & SDIO_INTERRUPT_EXT_SAI) {235 data |= SDIO_INTERRUPT_EXT_EAI;236 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,237 data, NULL);238 if (ret)239 goto out;240 241 card->cccr.enable_async_irq = 1;242 }243 }244 245 /* if no uhs mode ensure we check for high speed */246 if (!card->sw_caps.sd3_bus_mode) {247 if (speed & SDIO_SPEED_SHS) {248 card->cccr.high_speed = 1;249 card->sw_caps.hs_max_dtr = 50000000;250 } else {251 card->cccr.high_speed = 0;252 card->sw_caps.hs_max_dtr = 25000000;253 }254 }255 }256 257out:258 return ret;259}260 261static int sdio_enable_wide(struct mmc_card *card)262{263 int ret;264 u8 ctrl;265 266 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))267 return 0;268 269 if (card->cccr.low_speed && !card->cccr.wide_bus)270 return 0;271 272 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);273 if (ret)274 return ret;275 276 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)277 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",278 mmc_hostname(card->host), ctrl);279 280 /* set as 4-bit bus width */281 ctrl &= ~SDIO_BUS_WIDTH_MASK;282 ctrl |= SDIO_BUS_WIDTH_4BIT;283 284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);285 if (ret)286 return ret;287 288 return 1;289}290 291/*292 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)293 * of the card. This may be required on certain setups of boards,294 * controllers and embedded sdio device which do not need the card's295 * pull-up. As a result, card detection is disabled and power is saved.296 */297static int sdio_disable_cd(struct mmc_card *card)298{299 int ret;300 u8 ctrl;301 302 if (!mmc_card_disable_cd(card))303 return 0;304 305 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);306 if (ret)307 return ret;308 309 ctrl |= SDIO_BUS_CD_DISABLE;310 311 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);312}313 314/*315 * Devices that remain active during a system suspend are316 * put back into 1-bit mode.317 */318static int sdio_disable_wide(struct mmc_card *card)319{320 int ret;321 u8 ctrl;322 323 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))324 return 0;325 326 if (card->cccr.low_speed && !card->cccr.wide_bus)327 return 0;328 329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);330 if (ret)331 return ret;332 333 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))334 return 0;335 336 ctrl &= ~SDIO_BUS_WIDTH_4BIT;337 ctrl |= SDIO_BUS_ASYNC_INT;338 339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);340 if (ret)341 return ret;342 343 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);344 345 return 0;346}347 348static int sdio_disable_4bit_bus(struct mmc_card *card)349{350 int err;351 352 if (mmc_card_sdio(card))353 goto out;354 355 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))356 return 0;357 358 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))359 return 0;360 361 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);362 if (err)363 return err;364 365out:366 return sdio_disable_wide(card);367}368 369 370static int sdio_enable_4bit_bus(struct mmc_card *card)371{372 int err;373 374 err = sdio_enable_wide(card);375 if (err <= 0)376 return err;377 if (mmc_card_sdio(card))378 goto out;379 380 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {381 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);382 if (err) {383 sdio_disable_wide(card);384 return err;385 }386 }387out:388 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);389 390 return 0;391}392 393 394/*395 * Test if the card supports high-speed mode and, if so, switch to it.396 */397static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)398{399 int ret;400 u8 speed;401 402 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))403 return 0;404 405 if (!card->cccr.high_speed)406 return 0;407 408 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);409 if (ret)410 return ret;411 412 if (enable)413 speed |= SDIO_SPEED_EHS;414 else415 speed &= ~SDIO_SPEED_EHS;416 417 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);418 if (ret)419 return ret;420 421 return 1;422}423 424/*425 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.426 */427static int sdio_enable_hs(struct mmc_card *card)428{429 int ret;430 431 ret = mmc_sdio_switch_hs(card, true);432 if (ret <= 0 || mmc_card_sdio(card))433 return ret;434 435 ret = mmc_sd_switch_hs(card);436 if (ret <= 0)437 mmc_sdio_switch_hs(card, false);438 439 return ret;440}441 442static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)443{444 unsigned max_dtr;445 446 if (mmc_card_hs(card)) {447 /*448 * The SDIO specification doesn't mention how449 * the CIS transfer speed register relates to450 * high-speed, but it seems that 50 MHz is451 * mandatory.452 */453 max_dtr = 50000000;454 } else {455 max_dtr = card->cis.max_dtr;456 }457 458 if (mmc_card_sd_combo(card))459 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));460 461 return max_dtr;462}463 464static unsigned char host_drive_to_sdio_drive(int host_strength)465{466 switch (host_strength) {467 case MMC_SET_DRIVER_TYPE_A:468 return SDIO_DTSx_SET_TYPE_A;469 case MMC_SET_DRIVER_TYPE_B:470 return SDIO_DTSx_SET_TYPE_B;471 case MMC_SET_DRIVER_TYPE_C:472 return SDIO_DTSx_SET_TYPE_C;473 case MMC_SET_DRIVER_TYPE_D:474 return SDIO_DTSx_SET_TYPE_D;475 default:476 return SDIO_DTSx_SET_TYPE_B;477 }478}479 480static void sdio_select_driver_type(struct mmc_card *card)481{482 int card_drv_type, drive_strength, drv_type;483 unsigned char card_strength;484 int err;485 486 card->drive_strength = 0;487 488 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;489 490 drive_strength = mmc_select_drive_strength(card,491 card->sw_caps.uhs_max_dtr,492 card_drv_type, &drv_type);493 494 if (drive_strength) {495 /* if error just use default for drive strength B */496 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,497 &card_strength);498 if (err)499 return;500 501 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);502 card_strength |= host_drive_to_sdio_drive(drive_strength);503 504 /* if error default to drive strength B */505 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,506 card_strength, NULL);507 if (err)508 return;509 card->drive_strength = drive_strength;510 }511 512 if (drv_type)513 mmc_set_driver_type(card->host, drv_type);514}515 516 517static int sdio_set_bus_speed_mode(struct mmc_card *card)518{519 unsigned int bus_speed, timing;520 int err;521 unsigned char speed;522 unsigned int max_rate;523 524 /*525 * If the host doesn't support any of the UHS-I modes, fallback on526 * default speed.527 */528 if (!mmc_host_uhs(card->host))529 return 0;530 531 bus_speed = SDIO_SPEED_SDR12;532 timing = MMC_TIMING_UHS_SDR12;533 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&534 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {535 bus_speed = SDIO_SPEED_SDR104;536 timing = MMC_TIMING_UHS_SDR104;537 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;538 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;539 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&540 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {541 bus_speed = SDIO_SPEED_DDR50;542 timing = MMC_TIMING_UHS_DDR50;543 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;544 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;545 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |546 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &547 SD_MODE_UHS_SDR50)) {548 bus_speed = SDIO_SPEED_SDR50;549 timing = MMC_TIMING_UHS_SDR50;550 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;551 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;552 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |553 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&554 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {555 bus_speed = SDIO_SPEED_SDR25;556 timing = MMC_TIMING_UHS_SDR25;557 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;558 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;559 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |560 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |561 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &562 SD_MODE_UHS_SDR12)) {563 bus_speed = SDIO_SPEED_SDR12;564 timing = MMC_TIMING_UHS_SDR12;565 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;566 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;567 }568 569 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);570 if (err)571 return err;572 573 speed &= ~SDIO_SPEED_BSS_MASK;574 speed |= bus_speed;575 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);576 if (err)577 return err;578 579 max_rate = min_not_zero(card->quirk_max_rate,580 card->sw_caps.uhs_max_dtr);581 582 mmc_set_timing(card->host, timing);583 mmc_set_clock(card->host, max_rate);584 585 return 0;586}587 588/*589 * UHS-I specific initialization procedure590 */591static int mmc_sdio_init_uhs_card(struct mmc_card *card)592{593 int err;594 595 if (!card->scr.sda_spec3)596 return 0;597 598 /* Switch to wider bus */599 err = sdio_enable_4bit_bus(card);600 if (err)601 goto out;602 603 /* Set the driver strength for the card */604 sdio_select_driver_type(card);605 606 /* Set bus speed mode of the card */607 err = sdio_set_bus_speed_mode(card);608 if (err)609 goto out;610 611 /*612 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and613 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.614 */615 if (!mmc_host_is_spi(card->host) &&616 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||617 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))618 err = mmc_execute_tuning(card);619out:620 return err;621}622 623static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,624 struct mmc_card *card)625{626 if (card)627 mmc_remove_card(card);628 629 /*630 * Reset the card by performing the same steps that are taken by631 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.632 *633 * sdio_reset() is technically not needed. Having just powered up the634 * hardware, it should already be in reset state. However, some635 * platforms (such as SD8686 on OLPC) do not instantly cut power,636 * meaning that a reset is required when restoring power soon after637 * powering off. It is harmless in other cases.638 *639 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,640 * is not necessary for non-removable cards. However, it is required641 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and642 * harmless in other situations.643 *644 */645 646 sdio_reset(host);647 mmc_go_idle(host);648 mmc_send_if_cond(host, ocr);649 return mmc_send_io_op_cond(host, 0, NULL);650}651 652/*653 * Handle the detection and initialisation of a card.654 *655 * In the case of a resume, "oldcard" will contain the card656 * we're trying to reinitialise.657 */658static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,659 struct mmc_card *oldcard)660{661 struct mmc_card *card;662 int err;663 int retries = 10;664 u32 rocr = 0;665 u32 ocr_card = ocr;666 667 WARN_ON(!host->claimed);668 669 /* to query card if 1.8V signalling is supported */670 if (mmc_host_uhs(host))671 ocr |= R4_18V_PRESENT;672 673try_again:674 if (!retries) {675 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));676 ocr &= ~R4_18V_PRESENT;677 }678 679 /*680 * Inform the card of the voltage681 */682 err = mmc_send_io_op_cond(host, ocr, &rocr);683 if (err)684 return err;685 686 /*687 * For SPI, enable CRC as appropriate.688 */689 if (mmc_host_is_spi(host)) {690 err = mmc_spi_set_crc(host, use_spi_crc);691 if (err)692 return err;693 }694 695 /*696 * Allocate card structure.697 */698 card = mmc_alloc_card(host, &sdio_type);699 if (IS_ERR(card))700 return PTR_ERR(card);701 702 if ((rocr & R4_MEMORY_PRESENT) &&703 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {704 card->type = MMC_TYPE_SD_COMBO;705 706 if (oldcard && (!mmc_card_sd_combo(oldcard) ||707 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {708 err = -ENOENT;709 goto mismatch;710 }711 } else {712 card->type = MMC_TYPE_SDIO;713 714 if (oldcard && !mmc_card_sdio(oldcard)) {715 err = -ENOENT;716 goto mismatch;717 }718 }719 720 /*721 * Call the optional HC's init_card function to handle quirks.722 */723 if (host->ops->init_card)724 host->ops->init_card(host, card);725 mmc_fixup_device(card, sdio_card_init_methods);726 727 card->ocr = ocr_card;728 729 /*730 * If the host and card support UHS-I mode request the card731 * to switch to 1.8V signaling level. No 1.8v signalling if732 * UHS mode is not enabled to maintain compatibility and some733 * systems that claim 1.8v signalling in fact do not support734 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already735 * 1.8v, the card sets S18A to 0 in the R4 response. So it will736 * fails to check rocr & R4_18V_PRESENT, but we still need to737 * try to init uhs card. sdio_read_cccr will take over this task738 * to make sure which speed mode should work.739 */740 if (rocr & ocr & R4_18V_PRESENT) {741 err = mmc_set_uhs_voltage(host, ocr_card);742 if (err == -EAGAIN) {743 mmc_sdio_pre_init(host, ocr_card, card);744 retries--;745 goto try_again;746 } else if (err) {747 ocr &= ~R4_18V_PRESENT;748 }749 }750 751 /*752 * For native busses: set card RCA and quit open drain mode.753 */754 if (!mmc_host_is_spi(host)) {755 err = mmc_send_relative_addr(host, &card->rca);756 if (err)757 goto remove;758 759 /*760 * Update oldcard with the new RCA received from the SDIO761 * device -- we're doing this so that it's updated in the762 * "card" struct when oldcard overwrites that later.763 */764 if (oldcard)765 oldcard->rca = card->rca;766 }767 768 /*769 * Read CSD, before selecting the card770 */771 if (!oldcard && mmc_card_sd_combo(card)) {772 err = mmc_sd_get_csd(card);773 if (err)774 goto remove;775 776 mmc_decode_cid(card);777 }778 779 /*780 * Select card, as all following commands rely on that.781 */782 if (!mmc_host_is_spi(host)) {783 err = mmc_select_card(card);784 if (err)785 goto remove;786 }787 788 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {789 /*790 * This is non-standard SDIO device, meaning it doesn't791 * have any CIA (Common I/O area) registers present.792 * It's host's responsibility to fill cccr and cis793 * structures in init_card().794 */795 mmc_set_clock(host, card->cis.max_dtr);796 797 if (card->cccr.high_speed) {798 mmc_set_timing(card->host, MMC_TIMING_SD_HS);799 }800 801 if (oldcard)802 mmc_remove_card(card);803 else804 host->card = card;805 806 return 0;807 }808 809 /*810 * Read the common registers. Note that we should try to811 * validate whether UHS would work or not.812 */813 err = sdio_read_cccr(card, ocr);814 if (err) {815 mmc_sdio_pre_init(host, ocr_card, card);816 if (ocr & R4_18V_PRESENT) {817 /* Retry init sequence, but without R4_18V_PRESENT. */818 retries = 0;819 goto try_again;820 }821 return err;822 }823 824 /*825 * Read the common CIS tuples.826 */827 err = sdio_read_common_cis(card);828 if (err)829 goto remove;830 831 if (oldcard) {832 if (card->cis.vendor == oldcard->cis.vendor &&833 card->cis.device == oldcard->cis.device) {834 mmc_remove_card(card);835 card = oldcard;836 } else {837 err = -ENOENT;838 goto mismatch;839 }840 }841 842 mmc_fixup_device(card, sdio_fixup_methods);843 844 if (mmc_card_sd_combo(card)) {845 err = mmc_sd_setup_card(host, card, oldcard != NULL);846 /* handle as SDIO-only card if memory init failed */847 if (err) {848 mmc_go_idle(host);849 if (mmc_host_is_spi(host))850 /* should not fail, as it worked previously */851 mmc_spi_set_crc(host, use_spi_crc);852 card->type = MMC_TYPE_SDIO;853 } else854 card->dev.type = &sd_type;855 }856 857 /*858 * If needed, disconnect card detection pull-up resistor.859 */860 err = sdio_disable_cd(card);861 if (err)862 goto remove;863 864 /* Initialization sequence for UHS-I cards */865 /* Only if card supports 1.8v and UHS signaling */866 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {867 err = mmc_sdio_init_uhs_card(card);868 if (err)869 goto remove;870 } else {871 /*872 * Switch to high-speed (if supported).873 */874 err = sdio_enable_hs(card);875 if (err > 0)876 mmc_set_timing(card->host, MMC_TIMING_SD_HS);877 else if (err)878 goto remove;879 880 /*881 * Change to the card's maximum speed.882 */883 mmc_set_clock(host, mmc_sdio_get_max_clock(card));884 885 /*886 * Switch to wider bus (if supported).887 */888 err = sdio_enable_4bit_bus(card);889 if (err)890 goto remove;891 }892 893 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&894 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {895 pr_err("%s: Host failed to negotiate down from 3.3V\n",896 mmc_hostname(host));897 err = -EINVAL;898 goto remove;899 }900 901 host->card = card;902 return 0;903 904mismatch:905 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));906remove:907 if (oldcard != card)908 mmc_remove_card(card);909 return err;910}911 912static int mmc_sdio_reinit_card(struct mmc_host *host)913{914 int ret;915 916 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);917 if (ret)918 return ret;919 920 return mmc_sdio_init_card(host, host->card->ocr, host->card);921}922 923/*924 * Host is being removed. Free up the current card.925 */926static void mmc_sdio_remove(struct mmc_host *host)927{928 int i;929 930 for (i = 0;i < host->card->sdio_funcs;i++) {931 if (host->card->sdio_func[i]) {932 sdio_remove_func(host->card->sdio_func[i]);933 host->card->sdio_func[i] = NULL;934 }935 }936 937 mmc_remove_card(host->card);938 host->card = NULL;939}940 941/*942 * Card detection - card is alive.943 */944static int mmc_sdio_alive(struct mmc_host *host)945{946 return mmc_select_card(host->card);947}948 949/*950 * Card detection callback from host.951 */952static void mmc_sdio_detect(struct mmc_host *host)953{954 int err;955 956 /* Make sure card is powered before detecting it */957 if (host->caps & MMC_CAP_POWER_OFF_CARD) {958 err = pm_runtime_resume_and_get(&host->card->dev);959 if (err < 0)960 goto out;961 }962 963 mmc_claim_host(host);964 965 /*966 * Just check if our card has been removed.967 */968 err = _mmc_detect_card_removed(host);969 970 mmc_release_host(host);971 972 /*973 * Tell PM core it's OK to power off the card now.974 *975 * The _sync variant is used in order to ensure that the card976 * is left powered off in case an error occurred, and the card977 * is going to be removed.978 *979 * Since there is no specific reason to believe a new user980 * is about to show up at this point, the _sync variant is981 * desirable anyway.982 */983 if (host->caps & MMC_CAP_POWER_OFF_CARD)984 pm_runtime_put_sync(&host->card->dev);985 986out:987 if (err) {988 mmc_sdio_remove(host);989 990 mmc_claim_host(host);991 mmc_detach_bus(host);992 mmc_power_off(host);993 mmc_release_host(host);994 }995}996 997/*998 * SDIO pre_suspend. We need to suspend all functions separately.999 * Therefore all registered functions must have drivers with suspend1000 * and resume methods. Failing that we simply remove the whole card.1001 */1002static int mmc_sdio_pre_suspend(struct mmc_host *host)1003{1004 int i;1005 1006 for (i = 0; i < host->card->sdio_funcs; i++) {1007 struct sdio_func *func = host->card->sdio_func[i];1008 if (func && sdio_func_present(func) && func->dev.driver) {1009 const struct dev_pm_ops *pmops = func->dev.driver->pm;1010 if (!pmops || !pmops->suspend || !pmops->resume)1011 /* force removal of entire card in that case */1012 goto remove;1013 }1014 }1015 1016 return 0;1017 1018remove:1019 if (!mmc_card_is_removable(host)) {1020 dev_warn(mmc_dev(host),1021 "missing suspend/resume ops for non-removable SDIO card\n");1022 /* Don't remove a non-removable card - we can't re-detect it. */1023 return 0;1024 }1025 1026 /* Remove the SDIO card and let it be re-detected later on. */1027 mmc_sdio_remove(host);1028 mmc_claim_host(host);1029 mmc_detach_bus(host);1030 mmc_power_off(host);1031 mmc_release_host(host);1032 host->pm_flags = 0;1033 1034 return 0;1035}1036 1037/*1038 * SDIO suspend. Suspend all functions separately.1039 */1040static int mmc_sdio_suspend(struct mmc_host *host)1041{1042 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));1043 1044 /* Prevent processing of SDIO IRQs in suspended state. */1045 mmc_card_set_suspended(host->card);1046 cancel_work_sync(&host->sdio_irq_work);1047 1048 mmc_claim_host(host);1049 1050 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))1051 sdio_disable_4bit_bus(host->card);1052 1053 if (!mmc_card_keep_power(host)) {1054 mmc_power_off(host);1055 } else if (host->retune_period) {1056 mmc_retune_timer_stop(host);1057 mmc_retune_needed(host);1058 }1059 1060 mmc_release_host(host);1061 1062 return 0;1063}1064 1065static int mmc_sdio_resume(struct mmc_host *host)1066{1067 int err = 0;1068 1069 /* Basic card reinitialization. */1070 mmc_claim_host(host);1071 1072 /*1073 * Restore power and reinitialize the card when needed. Note that a1074 * removable card is checked from a detect work later on in the resume1075 * process.1076 */1077 if (!mmc_card_keep_power(host)) {1078 mmc_power_up(host, host->card->ocr);1079 /*1080 * Tell runtime PM core we just powered up the card,1081 * since it still believes the card is powered off.1082 * Note that currently runtime PM is only enabled1083 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD1084 */1085 if (host->caps & MMC_CAP_POWER_OFF_CARD) {1086 pm_runtime_disable(&host->card->dev);1087 pm_runtime_set_active(&host->card->dev);1088 pm_runtime_enable(&host->card->dev);1089 }1090 err = mmc_sdio_reinit_card(host);1091 } else if (mmc_card_wake_sdio_irq(host)) {1092 /*1093 * We may have switched to 1-bit mode during suspend,1094 * need to hold retuning, because tuning only supprt1095 * 4-bit mode or 8 bit mode.1096 */1097 mmc_retune_hold_now(host);1098 err = sdio_enable_4bit_bus(host->card);1099 mmc_retune_release(host);1100 }1101 1102 if (err)1103 goto out;1104 1105 /* Allow SDIO IRQs to be processed again. */1106 mmc_card_clr_suspended(host->card);1107 1108 if (host->sdio_irqs) {1109 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))1110 wake_up_process(host->sdio_irq_thread);1111 else if (host->caps & MMC_CAP_SDIO_IRQ)1112 schedule_work(&host->sdio_irq_work);1113 }1114 1115out:1116 mmc_release_host(host);1117 1118 host->pm_flags &= ~MMC_PM_KEEP_POWER;1119 return err;1120}1121 1122static int mmc_sdio_runtime_suspend(struct mmc_host *host)1123{1124 /* No references to the card, cut the power to it. */1125 mmc_claim_host(host);1126 mmc_power_off(host);1127 mmc_release_host(host);1128 1129 return 0;1130}1131 1132static int mmc_sdio_runtime_resume(struct mmc_host *host)1133{1134 int ret;1135 1136 /* Restore power and re-initialize. */1137 mmc_claim_host(host);1138 mmc_power_up(host, host->card->ocr);1139 ret = mmc_sdio_reinit_card(host);1140 mmc_release_host(host);1141 1142 return ret;1143}1144 1145/*1146 * SDIO HW reset1147 *1148 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW1149 * reset was asynchronously scheduled, else a negative error code.1150 */1151static int mmc_sdio_hw_reset(struct mmc_host *host)1152{1153 struct mmc_card *card = host->card;1154 1155 /*1156 * In case the card is shared among multiple func drivers, reset the1157 * card through a rescan work. In this way it will be removed and1158 * re-detected, thus all func drivers becomes informed about it.1159 */1160 if (atomic_read(&card->sdio_funcs_probed) > 1) {1161 if (mmc_card_removed(card))1162 return 1;1163 host->rescan_entered = 0;1164 mmc_card_set_removed(card);1165 _mmc_detect_change(host, 0, false);1166 return 1;1167 }1168 1169 /*1170 * A single func driver has been probed, then let's skip the heavy1171 * hotplug dance above and execute the reset immediately.1172 */1173 mmc_power_cycle(host, card->ocr);1174 return mmc_sdio_reinit_card(host);1175}1176 1177static int mmc_sdio_sw_reset(struct mmc_host *host)1178{1179 mmc_set_clock(host, host->f_init);1180 sdio_reset(host);1181 mmc_go_idle(host);1182 1183 mmc_set_initial_state(host);1184 mmc_set_initial_signal_voltage(host);1185 1186 return mmc_sdio_reinit_card(host);1187}1188 1189static const struct mmc_bus_ops mmc_sdio_ops = {1190 .remove = mmc_sdio_remove,1191 .detect = mmc_sdio_detect,1192 .pre_suspend = mmc_sdio_pre_suspend,1193 .suspend = mmc_sdio_suspend,1194 .resume = mmc_sdio_resume,1195 .runtime_suspend = mmc_sdio_runtime_suspend,1196 .runtime_resume = mmc_sdio_runtime_resume,1197 .alive = mmc_sdio_alive,1198 .hw_reset = mmc_sdio_hw_reset,1199 .sw_reset = mmc_sdio_sw_reset,1200};1201 1202 1203/*1204 * Starting point for SDIO card init.1205 */1206int mmc_attach_sdio(struct mmc_host *host)1207{1208 int err, i, funcs;1209 u32 ocr, rocr;1210 struct mmc_card *card;1211 1212 WARN_ON(!host->claimed);1213 1214 err = mmc_send_io_op_cond(host, 0, &ocr);1215 if (err)1216 return err;1217 1218 mmc_attach_bus(host, &mmc_sdio_ops);1219 if (host->ocr_avail_sdio)1220 host->ocr_avail = host->ocr_avail_sdio;1221 1222 1223 rocr = mmc_select_voltage(host, ocr);1224 1225 /*1226 * Can we support the voltage(s) of the card(s)?1227 */1228 if (!rocr) {1229 err = -EINVAL;1230 goto err;1231 }1232 1233 /*1234 * Detect and init the card.1235 */1236 err = mmc_sdio_init_card(host, rocr, NULL);1237 if (err)1238 goto err;1239 1240 card = host->card;1241 1242 /*1243 * Enable runtime PM only if supported by host+card+board1244 */1245 if (host->caps & MMC_CAP_POWER_OFF_CARD) {1246 /*1247 * Do not allow runtime suspend until after SDIO function1248 * devices are added.1249 */1250 pm_runtime_get_noresume(&card->dev);1251 1252 /*1253 * Let runtime PM core know our card is active1254 */1255 err = pm_runtime_set_active(&card->dev);1256 if (err)1257 goto remove;1258 1259 /*1260 * Enable runtime PM for this card1261 */1262 pm_runtime_enable(&card->dev);1263 }1264 1265 /*1266 * The number of functions on the card is encoded inside1267 * the ocr.1268 */1269 funcs = (ocr & 0x70000000) >> 28;1270 card->sdio_funcs = 0;1271 1272 /*1273 * Initialize (but don't add) all present functions.1274 */1275 for (i = 0; i < funcs; i++, card->sdio_funcs++) {1276 err = sdio_init_func(host->card, i + 1);1277 if (err)1278 goto remove;1279 1280 /*1281 * Enable Runtime PM for this func (if supported)1282 */1283 if (host->caps & MMC_CAP_POWER_OFF_CARD)1284 pm_runtime_enable(&card->sdio_func[i]->dev);1285 }1286 1287 /*1288 * First add the card to the driver model...1289 */1290 mmc_release_host(host);1291 err = mmc_add_card(host->card);1292 if (err)1293 goto remove_added;1294 1295 /*1296 * ...then the SDIO functions.1297 */1298 for (i = 0;i < funcs;i++) {1299 err = sdio_add_func(host->card->sdio_func[i]);1300 if (err)1301 goto remove_added;1302 }1303 1304 if (host->caps & MMC_CAP_POWER_OFF_CARD)1305 pm_runtime_put(&card->dev);1306 1307 mmc_claim_host(host);1308 return 0;1309 1310 1311remove:1312 mmc_release_host(host);1313remove_added:1314 /*1315 * The devices are being deleted so it is not necessary to disable1316 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card1317 * because it needs to be active to remove any function devices that1318 * were probed, and after that it gets deleted.1319 */1320 mmc_sdio_remove(host);1321 mmc_claim_host(host);1322err:1323 mmc_detach_bus(host);1324 1325 pr_err("%s: error %d whilst initialising SDIO card\n",1326 mmc_hostname(host), err);1327 1328 return err;1329}1330 1331